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N a_{2} B_{4} O_{7} . 10 H_{2} O

K C l . M g C l_{2} . 6 H_{2} O

F e S O_{4} . (N H_{4})_{2} S O_{4} . 6 H_{2} O

K_{2} O . A l_{2} O_{3} . 6 S i O_{2}

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ANS : 5

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